吴志锋，宋义全

（内蒙古科技大学材料与冶金学院，内蒙古包头 014000  ）

关键词：干湿交替；XRD；腐蚀速率；交流阻抗（EIS）

中图分类号：TG172.3 文献标志码：A

摘要：通过实验室加速模拟研究了 07MnVTiNb 耐候钢在沿海大气环境中的腐蚀规律与行为，采用 X-ray 对基体的腐蚀产物进行了分析，应用动电位极化曲线和交流阻抗谱（ EIS ）等分析方法研究了裸钢和带锈试样的电化学特征。结果表明：腐蚀前期的腐蚀速率大于后期。含 La 的试样钢腐蚀电流密度较小，锈层电阻值较大，耐蚀性更好，随着干湿交替腐蚀的进行，腐蚀电位正向移动。 07MnVTiNb 耐候钢的腐蚀产物中含有 α-FeOOH ， β-FeOOH ，少量的 γ-FeOOH 和 Fe₂O₃ 等，添加 La 的试样的保护性锈层 α-FeOOH 更多，对基体有较好的粘附性。

Study on corrosion behaviorof 07MnVTiNb weathering steel in simulated coastal atmospheric environment

Wu Zhifeng，SONG Yiquan

（School of material andmetallurgy，InnerMongolia University of Science and Technology，Baotou 014000，china）

Key words：Alternate wetting and drying;XRD;Corrosionrate; AC impedance(EIS)

Abstract ： The corrosion behavior and behavior of 07MnVTiNbweathering steel in coastal atmospheric environment were studied by laboratorysimulation. The corrosion products were analyzed by using X-raydiffraction spectrum. The electrochemical characteristicsof bare steel and rust sample were studied by means of dynamic potentialpolarization curves and AC impedance spectroscopy (EIS). The results show thatthe corrosion rate is higher than that of the later stage. The corrosioncurrent density of the sample with La is smaller, and the corrosion resistanceof the rust layer is larger, which indicates that the corrosion resistance ofLa sample is better, and the corrosion potential is moving forward with thealternation of wet and dry etching. 07MnVTiNb weathering steel corrosionproducts contains α -FeOOH, β-FeOOH, a small amount of γ -FeOOH and Fe₂O₃.Thethe specimens with addition of La obtained the protective rust layer α-FeOOH more, resulting in the better adhesion of the matrix.